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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a91a808db85b9bb685da2e2c80afadc13c751dd6d0b400782ffe7c7bda1a4f' 
  AND token = 'inS/E9FNo1ZJSWC7T04S4EsnoOdLrouf9sX/Qthf+PY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}